code: def test_chiral_weave():
      """Test weave features on a molecule with chiral structure."""
      mols = [r"F\C=C\F"]
      featurizer = dc.feat.WeaveFeaturizer(use_chirality=True)
      mol_list = featurizer.featurize(mols)
      mol = mol_list[0]
  
      # Only 4 atoms
      assert mol.get_num_atoms() == 4
  
      # Test feature sizes for chirality
      assert mol.get_num_features() == 78
  
file_path: deepchem/deepchem/feat/tests/test_weave.py
imports: import numpy
  import deepchem
  from deepchem.feat.graph_features import max_pair_distance_pairs
label_desc: Use image node_id 4 for calling a global function with example usage: test_chiral_weave() without return types